Recently I've built two 100m-ish Audio Delay Modules from Mark Graves. One with pretty standard MN3007, one with Coolaudio's V3205SD. The second one was little harder so I want to document it here.
Supply voltage was chosen 5V (-5V to the chip GND, 0V to the chip Vdd) as it was recommended by the datasheet and many other modules using this BBD.

Changes in the PCB (from build doc) needed to use V3205 chip in 100m-ish module was little unclear to me so I had to draw my own diagram for part of schematic with BBD chip.
Also BBD output resistors (R53 and R54) were showed incorrectly to be connected to the ground while they should be connected to the lowest potential (BBD chip GND = -5V).
Correct connection for the R53 and R54 is showed on the photo:

Here are the signals taken from the oscilloscope in the different module points.

I did make some initial tests with a couple of (supposed) V3205D's, but both failed. I tried to run them at just below the maximum CololAudio specified supply of 8V. I suspect that they may have been chinese copies, and only OK running at the more common stompbox 5V supply.

Would you object if I added your diagram etc. to the end of the build doc (with credit)?

fitzgreyve wrote:Many thanks for posting this! I'm glad that you got it working.

I did make some initial tests with a couple of (supposed) V3205D's, but both failed. I tried to run them at just below the maximum CololAudio specified supply of 8V. I suspect that they may have been chinese copies, and only OK running at the more common stompbox 5V supply.

Would you object if I added your diagram etc. to the end of the build doc (with credit)?

How are noise levels with the V3205 ?

No problem with adding my diagrams to the build doc.
As for noise I didn't checked it yet (I've ended all this work late night yesterday). One thing to be fixed, I think, is that output level is too low (but it is for V3205 and MN3007 also) and may be amplified a little.

Today I have tested how V3205SD works with different supply voltages. No problems with voltages up to 8V (max usable supply voltage by datasheet).
Here are the oscilloscope screenshots taken at TP1 (blue: input signal, yellow: TP1).
5V:
6V:
7V:
8V:

Closer look at TP1 signal (8V supply).
Max delay:
Min delay:

Additionally I have take difference in TP1 between good and bad PR3 setting.
Bad PR3 setting:
Good PR3 setting: